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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 213

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Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Description
Corrective action
 Warning
Output is not shut off when a protective function is activated.
Operation panel
indication
Name
Description
Check point
Corrective action
212
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
Er4
Mode designation error
• Parameter setting is attempted in the External or NET operation mode when Pr.77 Parameter write selection =
"1".
• Parameter write is attempted when the command source is not at the operation panel.
• Check that operation mode is PU operation mode.
• Check that the Pr.551 PU mode operation command source selection setting is correct.
• After setting the operation mode to the "PU operation mode", set the parameter. (Refer to
• When Pr.77 = "2", parameter write is enabled regardless of the operation mode. (Refer to
• Set Pr.551 = "2". (Refer to
page
Err.
• The RES signal is turned ON.
• This error may occur when the voltage at the input side of the inverter drops.
• Turn OFF the RES signal.
• Check the voltage on the input side of the inverter.
OLC
Stall prevention (overcurrent)
• When the output current of the inverter increases, the stall prevention (overcurrent) function is activated.
• The following section explains the stall prevention (overcurrent) function.
When the inverter output current exceeds the stall prevention level (Pr.22 Stall
prevention operation level, etc.), this function stops the increase in frequency until the
During acceleration
overload current decreases to prevent the inverter from resulting in overcurrent trip.
When the overload current is reduced below stall prevention operation level, this function
increases the frequency again.
When the inverter output current exceeds the stall prevention level (Pr.22 Stall
prevention operation level, etc.), this function decreases frequency until the overload
During constant-
current decreases to prevent the inverter from resulting in overcurrent trip. When the
speed operation
overload current is reduced below stall prevention operation level, this function increases
the frequency up to the set value.
When the inverter output current exceeds the stall prevention level (Pr.22 Stall
prevention operation level, etc.), this function stops the decrease in frequency until the
During deceleration
overload current decreases to prevent the inverter from resulting in overcurrent trip.
When the overload current is reduced below stall prevention operation level, this function
decreases the frequency again.
• Check that the Pr.0 Torque boost setting is not too large.
• The Pr.7 Acceleration time and Pr.8 Deceleration time settings may be too short.
• Check that the load is not too heavy.
• Check for any failures in peripheral devices.
• Check that Pr.13 Starting frequency is not too large.
• Check that Pr.22 Stall prevention operation level is appropriate.
• Gradually increase or decrease the Pr.0 setting by 1% at a time and check the motor status. (Refer to
193.)
• Set a larger value in Pr.7 and Pr.8. (Refer to
• Reduce the load.
• Try General-purpose magnetic flux vector control.
• The stall prevention operation current can be set in Pr.22 Stall prevention operation level. (Initial value is
150%.) Acceleration/deceleration time may change. Increase the stall prevention operation level with Pr.22
Stall prevention operation level, or disable stall prevention with Pr.156 Stall prevention operation selection.
(Use Pr.156 to set either operation continued or not at OL operation.)
105.)
FR-LU08 indication
page
93.)
page
100.)
page
89.)
OL
page

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